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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db80afc2cc72532ab54a471b9318a12c80819efa38c94a36a1d768222d09e86f' 
  AND token = 'oMAw4NC/Rb8sJVAM100RFbjxAauIfcJLO5kLD4SGscA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}